Revenue from Contracts with Customers (Capitalized Contract Cost) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Contract costs capitalized during the period	$ 13,237
Costs amortized during the period	(16,869)
Change in capitalized contract cost, other	(1,819)
Balance of costs to obtain a contract	$ 25,569	$ 31,020